New radio observations of QSO 0957+561 confirm optical-to radio time delay

Details New radio observations of QSO 0957+561 confirm optical-to radio time delay New radio observations of QSO 0957+561 confirm optical-to radio time delay

2005-02-02

arxiv.org/abs/astro-ph/0502030v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, Galaxies: The Third Dimension, Mexica, Cosumel, 2001

Scientific paper

In our previous publications have been reported about possible time delay between optical and radio (6 cm) variations in QSO 0957+561 and noted that the result can be tested with new radio observations. Here we have made this test using new published (Haarasma et al., 1999) radio observations of the object in 6 cm and 4 cm. We have found that the new observations confirm optical-to-radio time delay. Additionally we have found that radio 6 cm variations followed 4 cm ones with time delay about 230 days. Obtained results imply existence of the variable beamed hard radiation in the nucleus of the QSO.

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